In Fig 12,PS is a diameter of a circle whose radius is 6 cm.Two points Q and R are taken on PS such that PQ=QR=RS.Two semicircles are drawn with PQ and QS as their respective diameters as shown in the figure.Find the perimeter and the area of the shaded region shown in figure.``(pi=3.14)`

In figure 12 PS is a diameter of a circle whose radius is 6cm . Two pint Q and R are taken on PS such that PQ= QR = RS . Two Semi-circles are drawn with PQ and QS as their respective diameters as shown in the figure. find the perimeter and the area of the shaded region shown in figure. (Take pi=3.14 )

In the given figure PQRS is a diameter of a circle 6cm . The length PQ, QR and RS are equal. Semi-circle are drawn on PQ and RS as diameter. If PS=12cm , find the area of the shaded region. (Take pi=3.14 )

In Fig.12.33.ABC is a quadrant of a circle of radius 20 cm and a semicircle is drawn with BC as diameter. Find the area of the shaded region.

A sector from teo concentric circle is shown in Fig.14.If the radii of the circles are respectively 3.5 cm and 7 cm,find the area of the shaded region in the figure.

In Fig.12.25,ABCD is a square of side 14 cm.with centres A,B,C and D,four circles are drawn such that each circle touch externally two of the remaining three circles.Find the area of the shaded region.

In given figure sectors of two concentric circles of radius 7 cm and 3.5 cm are shown. Find the area of the shaded region.

Find the area of the shaded region in the given figure, where ABCD is a square of side 10cm and semi-circles are drawn with each side of the square as diameter.

In the figure BMD is a segment of a circle with centre O and /_BOD=90^@ , BO=OD=40cm . Find the area and perimeter of the shaded region. (Use pi=3.14 )

The radius of two circles are in the ratio 3 : 4 and sum of their areas is equal to the area of a circle whose radius is 35 cm. Find the ratio of the diameters.

From each cornor of a square of side 4 cm a quadrant of a circle of radius 1 cm is cut and also a circle of diameter 2 cm is cut as shown in Fig.12.23.Find the area of the remaining portion of the square.